CVE-2026-0300
Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability
Summary
Palo Alto Networks PAN-OS contains an out-of-bounds write vulnerability in the User-ID Authentication Portal (aka Captive Portal) service that can allow an unauthenticated attacker to execute arbitrary code with root privileges on the PA-Series and VM-Series firewalls by sending specially crafted packets.
Affected software
Vendor: Palo Alto Networks · Product: PAN-OS
Weakness types (CWE):
What to do
This vulnerability appears in CISA's Known Exploited Vulnerabilities catalog, meaning it is being exploited in the wild. Prioritize patching affected systems and verify exposure across your estate.
Related vulnerabilities in Palo Alto Networks
| CVE | Name | EPSS | Exploited |
|---|---|---|---|
| CVE-2024-3400 | Palo Alto Networks PAN-OS Command Injection Vulnerability | 100.0% | Yes |
| CVE-2024-0012 | Palo Alto Networks PAN-OS Management Interface Authentication Bypass Vulnerabili | 99.7% | Yes |
| CVE-2024-9465 | Palo Alto Networks Expedition SQL Injection Vulnerability | 99.6% | Yes |
| CVE-2024-9463 | Palo Alto Networks Expedition OS Command Injection Vulnerability | 98.5% | Yes |
| CVE-2025-0108 | Palo Alto Networks PAN-OS Authentication Bypass Vulnerability | 98.5% | Yes |
| CVE-2017-15944 | Palo Alto Networks PAN-OS Remote Code Execution Vulnerability | 98.3% | Yes |
| CVE-2024-9474 | Palo Alto Networks PAN-OS Management Interface OS Command Injection Vulnerabilit | 94.8% | Yes |
| CVE-2026-0257 | Palo Alto Networks PAN-OS Authentication Bypass Vulnerability | 93.9% | Yes |
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